Metformin tends not to drop your blood glucose below 4. Non diabetic Bg readings are about 5 at all times, with few fluctuations. that then is the target to aim for. Sounds like your morning ( fasting) BG is a little high.
Use your meter, testing 2 hours after eating to find which foods put you up and try to keep below 7. that's the level at which damage beins To the micro blood vessels, in eyes, kidneys and other places.
Doctors tend to be happy with any reading under about 10. That's to allow for non-compliant patients, but is really too high. Under 7 is attainable if you keep your carb intake down. look throught the threads at recipes.